Commit | Line | Data |
d444a431 |
1 | #!/usr/local/bin/perl -w |
2 | 'di'; |
3 | 'ig00'; |
4 | ############################################################################## |
5 | ## |
6 | ## search |
7 | ## |
8 | ## Jeffrey Friedl (jfriedl@omron.co.jp), Dec 1994. |
9 | ## Copyright 19.... ah hell, just take it. |
10 | ## |
11 | ## BLURB: |
12 | ## A combo of find and grep -- more or less do a 'grep' on a whole |
13 | ## directory tree. Fast, with lots of options. Much more powerful than |
14 | ## the simple "find ... | xargs grep ....". Has a full man page. |
15 | ## Powerfully customizable. |
16 | ## |
17 | ## This file is big, but mostly comments and man page. |
18 | ## |
19 | ## See man page for usage info. |
20 | ## Return value: 2=error, 1=nothing found, 0=something found. |
21 | ## |
22 | |
23 | $version = "950918.5"; |
24 | ## |
25 | ## "950918.5"; |
26 | ## Changed all 'sysread' to 'read' because Linux perl's don't seem |
27 | ## to like sysread() |
28 | ## |
29 | ## "941227.4"; |
30 | ## Added -n, -u |
31 | ## |
32 | ## "941222.3" |
33 | ## Added -nice (due to Lionel Cons <Lionel.Cons@cern.ch>) |
34 | ## Removed any leading "./" from name. |
35 | ## Added default flags for ~/.search, including TTY, -nice, -list, etc. |
36 | ## Program name now has path removed when printed in diagnostics. |
37 | ## Added simple tilde-expansion to -dir arg. |
38 | ## Added -dskip, etc. Fixed -iregex bug. |
39 | ## Changed -dir to be additive, adding -ddir. |
40 | ## Now screen out devices, pipes, and sockets. |
41 | ## More tidying and lots of expanding of the man page |
42 | ## |
43 | ## |
44 | ## "941217.2"; |
45 | ## initial release. |
46 | |
47 | $stripped=0; |
48 | |
49 | &init; |
50 | $rc_file = join('/', $ENV{'HOME'}, ".search"); |
51 | |
52 | &check_args; |
53 | |
54 | ## Make sure we've got a regex. |
55 | ## Don't need one if -find or -showrc was specified. |
56 | $!=2, die "expecting regex arguments.\n" |
57 | if $FIND_ONLY == 0 && $showrc == 0 && @ARGV == 0; |
58 | |
59 | &prepare_to_search($rc_file); |
60 | |
61 | &import_program if !defined &dodir; ## BIG key to speed. |
62 | |
63 | ## do search while there are directories to be done. |
64 | &dodir(shift(@todo)) while @todo; |
65 | |
66 | &clear_message if $VERBOSE && $STDERR_IS_TTY; |
67 | exit($retval); |
68 | ############################################################################### |
69 | |
70 | sub init |
71 | { |
72 | ## initialize variables that might be reset by command-line args |
73 | $DOREP=0; ## set true by -dorep (redo multi-hardlink files) |
74 | $DO_SORT=0; ## set by -sort (sort files in a dir before checking) |
75 | $FIND_ONLY=0; ## set by -find (don't search files) |
76 | $LIST_ONLY=0; ## set true by -l (list filenames only) |
77 | $NEWER=0; ## set by -newer, "-mtime -###" |
78 | $NICE=0; ## set by -nice (print human-readable output) |
79 | $NOLINKS=0; ## set true by -nolinks (don't follow symlinks) |
80 | $OLDER=0; ## set by -older, "-mtime ###" |
81 | $PREPEND_FILENAME=1; ## set false by -h (don't prefix lines with filename) |
82 | $REPORT_LINENUM=0; ## set true by -n (show line numbers) |
83 | $VERBOSE=0; ## set to a value by -v, -vv, etc. (verbose messages) |
84 | $WHY=0; ## set true by -why, -vvv+ (report why skipped) |
85 | $XDEV=0; ## set true by -xdev (stay on one filesystem) |
86 | $all=0; ## set true by -all (don't skip many kinds of files) |
87 | $iflag = ''; ## set to 'i' by -i (ignore case); |
88 | $norc=0; ## set by -norc (don't load rc file) |
89 | $showrc=0; ## set by -showrc (show what happens with rc file) |
90 | $underlineOK=0; ## set true by -u (watch for underline stuff) |
91 | $words=0; ## set true by -w (match whole-words only) |
92 | $DELAY=0; ## inter-file delay (seconds) |
93 | $retval=1; ## will set to 0 if we find anything. |
94 | |
95 | ## various elements of stat() that we might access |
96 | $STAT_DEV = 1; |
97 | $STAT_INODE = 2; |
98 | $STAT_MTIME = 9; |
99 | |
100 | $VV_PRINT_COUNT = 50; ## with -vv, print every VV_PRINT_COUNT files, or... |
101 | $VV_SIZE = 1024*1024; ## ...every VV_SIZE bytes searched |
102 | $vv_print = $vv_size = 0; ## running totals. |
103 | |
104 | ## set default options, in case the rc file wants them |
105 | $opt{'TTY'}= 1 if -t STDOUT; |
106 | |
107 | ## want to know this for debugging message stuff |
108 | $STDERR_IS_TTY = -t STDERR ? 1 : 0; |
109 | $STDERR_SCREWS_STDOUT = ($STDERR_IS_TTY && -t STDOUT) ? 1 : 0; |
110 | |
111 | $0 =~ s,.*/,,; ## clean up $0 for any diagnostics we'll be printing. |
112 | } |
113 | |
114 | ## |
115 | ## Check arguments. |
116 | ## |
117 | sub check_args |
118 | { |
119 | while (@ARGV && $ARGV[0] =~ m/^-/) |
120 | { |
121 | $arg = shift(@ARGV); |
122 | |
123 | if ($arg eq '-version' || ($VERBOSE && $arg eq '-help')) { |
124 | print qq/Jeffrey's file search, version "$version".\n/; |
125 | exit(0) unless $arg eq '-help'; |
126 | } |
127 | if ($arg eq '-help') { |
128 | print <<INLINE_LITERAL_TEXT; |
129 | usage: $0 [options] [-e] [PerlRegex ....] |
130 | OPTIONS TELLING *WHERE* TO SEARCH: |
131 | -dir DIR start search at the named directory (default is current dir). |
132 | -xdev stay on starting file system. |
133 | -sort sort the files in each directory before processing. |
134 | -nolinks don't follow symbolic links. |
135 | OPTIONS TELLING WHICH FILES TO EVEN CONSIDER: |
136 | -mtime # consider files modified > # days ago (-# for < # days old) |
137 | -newer FILE consider files modified more recently than FILE (also -older) |
138 | -name GLOB consider files whose name matches pattern (also -regex). |
139 | -skip GLOB opposite of -name: identifies files to not consider. |
140 | -path GLOB like -name, but for files whose whole path is described. |
141 | -dpath/-dregex/-dskip versions for selecting or pruning directories. |
142 | -all don't skip any files marked to be skipped by the startup file. |
143 | -x<SPECIAL> (see manual, and/or try -showrc). |
144 | -why report why a file isn't checked (also implied by -vvvv). |
145 | OPTIONS TELLING WHAT TO DO WITH FILES THAT WILL BE CONSIDERED: |
146 | -f | -find just list files (PerlRegex ignored). Default is to grep them. |
147 | -ff | -ffind Does a faster -find (implies -find -all -dorep) |
148 | OPTIONS CONTROLLING HOW THE SEARCH IS DONE (AND WHAT IS PRINTED): |
149 | -l | -list only list files with matches, not the lines themselves. |
150 | -nice | -nnice print more "human readable" output. |
151 | -n prefix each output line with its line number in the file. |
152 | -h don't prefix output lines with file name. |
153 | -u also look "inside" manpage-style underlined text |
154 | -i do case-insensitive searching. |
155 | -w match words only (as defined by perl's \\b). |
156 | OTHER OPTIONS: |
157 | -v, -vv, -vvv various levels of message verbosity. |
158 | -e end of options (in case a regex looks like an option). |
159 | -showrc show what the rc file sets, then exit. |
160 | -norc don't load the rc file. |
161 | -dorep check files with multiple hard links multiple times. |
162 | INLINE_LITERAL_TEXT |
163 | print "Use -v -help for more verbose help.\n" unless $VERBOSE; |
164 | print "This script file is also a man page.\n" unless $stripped; |
165 | print <<INLINE_LITERAL_TEXT if $VERBOSE; |
166 | |
167 | If -f (or -find) given, PerlRegex is optional and ignored. |
168 | Otherwise, will search for files with lines matching any of the given regexes. |
169 | |
170 | Combining things like -name and -mtime implies boolean AND. |
171 | However, duplicating things (such as -name '*.c' -name '*.txt') implies OR. |
172 | |
173 | -mtime may be given floating point (i.e. 1.5 is a day and a half). |
174 | -iskip/-idskip/-ipath/... etc are case-insensitive versions. |
175 | |
176 | If any letter in -newer/-older is upper case, "or equal" is |
177 | inserted into the test. |
178 | |
179 | You can always find the latest version on the World Wide Web in |
180 | http://www.wg.omron.co.jp/~jfriedl/perl/ |
181 | INLINE_LITERAL_TEXT |
182 | exit(0); |
183 | } |
184 | $DOREP=1, next if $arg eq '-dorep'; ## do repeats |
185 | $DO_SORT=1, next if $arg eq '-sort'; ## sort files |
186 | $NOLINKS=1, next if $arg eq '-nolinks'; ## no sym. links |
187 | $PREPEND_FILENAME=0, next if $arg eq '-h'; ## no filename prefix |
188 | $REPORT_LINENUM=1, next if $arg eq '-n'; ## show line numbers |
189 | $WHY=1, next if $arg eq '-why'; ## tell why skipped |
190 | $XDEV=1, next if $arg eq '-xdev'; ## don't leave F.S. |
191 | $all=1,$opt{'-all'}=1,next if $arg eq '-all'; ## don't skip *.Z, etc |
192 | $iflag='i', next if $arg eq '-i'; ## ignore case |
193 | $norc=1, next if $arg eq '-norc'; ## don't load rc file |
194 | $showrc=1, next if $arg eq '-showrc'; ## show rc file |
195 | $underlineOK=1, next if $arg eq '-u'; ## look throuh underln. |
196 | $words=1, next if $arg eq '-w'; ## match "words" only |
197 | &strip if $arg eq '-strip'; ## dump this program |
198 | last if $arg eq '-e'; |
199 | $DELAY=$1, next if $arg =~ m/-delay(\d+)/; |
200 | |
201 | $FIND_ONLY=1, next if $arg =~/^-f(ind)?$/;## do "find" only |
202 | |
203 | $FIND_ONLY=1, $DOREP=1, $all=1, |
204 | next if $arg =~/^-ff(ind)?$/;## fast -find |
205 | $LIST_ONLY=1,$opt{'-list'}=1, |
206 | next if $arg =~/^-l(ist)?$/;## only list files |
207 | |
208 | if ($arg =~ m/^-(v+)$/) { ## verbosity |
209 | $VERBOSE =length($1); |
210 | foreach $len (1..$VERBOSE) { $opt{'-'.('v' x $len)}=1 } |
211 | next; |
212 | } |
213 | if ($arg =~ m/^-(n+)ice$/) { ## "nice" output |
214 | $NICE =length($1); |
215 | foreach $len (1..$NICE) { $opt{'-'.('n' x $len).'ice'}=1 } |
216 | next; |
217 | } |
218 | |
219 | if ($arg =~ m/^-(i?)(d?)skip$/) { |
220 | local($i) = $1 eq 'i'; |
221 | local($d) = $2 eq 'd'; |
222 | $! = 2, die qq/$0: expecting glob arg to -$arg\n/ unless @ARGV; |
223 | foreach (split(/\s+/, shift @ARGV)) { |
224 | if ($d) { |
225 | $idskip{$_}=1 if $i; |
226 | $dskip{$_}=1; |
227 | } else { |
228 | $iskip{$_}=1 if $i; |
229 | $skip{$_}=1; |
230 | } |
231 | } |
232 | next; |
233 | } |
234 | |
235 | |
236 | if ($arg =~ m/^-(i?)(d?)(regex|path|name)$/) { |
237 | local($i) = $1 eq 'i'; |
238 | $! = 2, die qq/$0: expecting arg to -$arg\n/ unless @ARGV; |
239 | foreach (split(/\s+/, shift @ARGV)) { |
240 | $iname{join(',', $arg, $_)}=1 if $i; |
241 | $name{join(',', $arg, $_)}=1; |
242 | } |
243 | next; |
244 | } |
245 | |
246 | if ($arg =~ m/^-d?dir$/) { |
247 | $opt{'-dir'}=1; |
248 | $! = 2, die qq/$0: expecting filename arg to -$arg\n/ unless @ARGV; |
249 | $start = shift(@ARGV); |
250 | $start =~ s#^~(/+|$)#$ENV{'HOME'}$1# if defined $ENV{'HOME'}; |
251 | $! = 2, die qq/$0: can't find ${arg}'s "$start"\n/ unless -e $start; |
252 | $! = 2, die qq/$0: ${arg}'s "$start" not a directory.\n/ unless -d _; |
253 | undef(@todo), $opt{'-ddir'}=1 if $arg eq '-ddir'; |
254 | push(@todo, $start); |
255 | next; |
256 | } |
257 | |
258 | if ($arg =~ m/^-(new|old)er$/i) { |
259 | $! = 2, die "$0: expecting filename arg to -$arg\n" unless @ARGV; |
260 | local($file, $time) = shift(@ARGV); |
261 | $! = 2, die qq/$0: can't stat -${arg}'s "$file"./ |
262 | unless $time = (stat($file))[$STAT_MTIME]; |
263 | local($upper) = $arg =~ tr/A-Z//; |
264 | if ($arg =~ m/new/i) { |
265 | $time++ unless $upper; |
266 | $NEWER = $time if $NEWER < $time; |
267 | } else { |
268 | $time-- unless $upper; |
269 | $OLDER = $time if $OLDER == 0 || $OLDER > $time; |
270 | } |
271 | next; |
272 | } |
273 | |
274 | if ($arg =~ m/-mtime/) { |
275 | $! = 2, die "$0: expecting numerical arg to -$arg\n" unless @ARGV; |
276 | local($days) = shift(@ARGV); |
277 | $! = 2, die qq/$0: inappropriate arg ($days) to $arg\n/ if $days==0; |
278 | $days *= 3600 * 24; |
279 | if ($days < 0) { |
280 | local($time) = $^T + $days; |
281 | $NEWER = $time if $NEWER < $time; |
282 | } else { |
283 | local($time) = $^T - $days; |
284 | $OLDER = $time if $OLDER == 0 || $OLDER > $time; |
285 | } |
286 | next; |
287 | } |
288 | |
289 | ## special user options |
290 | if ($arg =~ m/^-x(.+)/) { |
291 | foreach (split(/[\s,]+/, $1)) { $user_opt{$_} = $opt{$_}= 1; } |
292 | next; |
293 | } |
294 | |
295 | $! = 2, die "$0: unknown arg [$arg]\n"; |
296 | } |
297 | } |
298 | |
299 | ## |
300 | ## Given a filename glob, return a regex. |
301 | ## If the glob has no globbing chars (no * ? or [..]), then |
302 | ## prepend an effective '*' to it. |
303 | ## |
304 | sub glob_to_regex |
305 | { |
306 | local($glob) = @_; |
307 | local(@parts) = $glob =~ m/\\.|[*?]|\[]?[^]]*]|[^[\\*?]+/g; |
308 | local($trueglob)=0; |
309 | foreach (@parts) { |
310 | if ($_ eq '*' || $_ eq '?') { |
311 | $_ = ".$_"; |
312 | $trueglob=1; ## * and ? are a real glob |
313 | } elsif (substr($_, 0, 1) eq '[') { |
314 | $trueglob=1; ## [..] is a real glob |
315 | } else { |
316 | s/^\\//; ## remove any leading backslash; |
317 | s/\W/\\$&/g; ## now quote anything dangerous; |
318 | } |
319 | } |
320 | unshift(@parts, '.*') unless $trueglob; |
321 | join('', '^', @parts, '$'); |
322 | } |
323 | |
324 | sub prepare_to_search |
325 | { |
326 | local($rc_file) = @_; |
327 | |
328 | $HEADER_BYTES=0; ## Might be set nonzero in &read_rc; |
329 | $last_message_length = 0; ## For &message and &clear_message. |
330 | |
331 | &read_rc($rc_file, $showrc) unless $norc; |
332 | exit(0) if $showrc; |
333 | |
334 | $NEXT_DIR_ENTRY = $DO_SORT ? 'shift @files' : 'readdir(DIR)'; |
335 | $WHY = 1 if $VERBOSE > 3; ## Arg -vvvv or above implies -why. |
336 | @todo = ('.') if @todo == 0; ## Where we'll start looking |
337 | |
338 | ## see if any user options were specified that weren't accounted for |
339 | foreach $opt (keys %user_opt) { |
340 | next if defined $seen_opt{$opt}; |
341 | warn "warning: -x$opt never considered.\n"; |
342 | } |
343 | |
344 | die "$0: multiple time constraints exclude all possible files.\n" |
345 | if ($NEWER && $OLDER) && ($NEWER > $OLDER); |
346 | |
347 | ## |
348 | ## Process any -skip/-iskip args that had been given |
349 | ## |
350 | local(@skip_test); |
351 | foreach $glob (keys %skip) { |
352 | $i = defined($iskip{$glob}) ? 'i': ''; |
353 | push(@skip_test, '$name =~ m/'. &glob_to_regex($glob). "/$i"); |
354 | } |
355 | if (@skip_test) { |
356 | $SKIP_TEST = join('||',@skip_test); |
357 | $DO_SKIP_TEST = 1; |
358 | } else { |
359 | $DO_SKIP_TEST = $SKIP_TEST = 0; |
360 | } |
361 | |
362 | ## |
363 | ## Process any -dskip/-idskip args that had been given |
364 | ## |
365 | local(@dskip_test); |
366 | foreach $glob (keys %dskip) { |
367 | $i = defined($idskip{$glob}) ? 'i': ''; |
368 | push(@dskip_test, '$name =~ m/'. &glob_to_regex($glob). "/$i"); |
369 | } |
370 | if (@dskip_test) { |
371 | $DSKIP_TEST = join('||',@dskip_test); |
372 | $DO_DSKIP_TEST = 1; |
373 | } else { |
374 | $DO_DSKIP_TEST = $DSKIP_TEST = 0; |
375 | } |
376 | |
377 | |
378 | ## |
379 | ## Process any -name, -path, -regex, etc. args that had been given. |
380 | ## |
381 | undef @name_test; |
382 | undef @dname_test; |
383 | foreach $key (keys %name) { |
384 | local($type, $pat) = split(/,/, $key, 2); |
385 | local($i) = defined($iname{$key}) ? 'i' : ''; |
386 | if ($type =~ /regex/) { |
387 | $pat =~ s/!/\\!/g; |
388 | $test = "\$name =~ m!^$pat\$!$i"; |
389 | } else { |
390 | local($var) = $type eq 'name' ? '$name' : '$file'; |
391 | $test = "$var =~ m/". &glob_to_regex($pat). "/$i"; |
392 | } |
393 | if ($type =~ m/^-i?d/) { |
394 | push(@dname_test, $test); |
395 | } else { |
396 | push(@name_test, $test); |
397 | } |
398 | } |
399 | if (@name_test) { |
400 | $GLOB_TESTS = join('||', @name_test); |
401 | |
402 | $DO_GLOB_TESTS = 1; |
403 | } else { |
404 | $GLOB_TESTS = $DO_GLOB_TESTS = 0; |
405 | } |
406 | if (@dname_test) { |
407 | $DGLOB_TESTS = join('||', @dname_test); |
408 | $DO_DGLOB_TESTS = 1; |
409 | } else { |
410 | $DGLOB_TESTS = $DO_DGLOB_TESTS = 0; |
411 | } |
412 | |
413 | |
414 | ## |
415 | ## Process any 'magic' things from the startup file. |
416 | ## |
417 | if (@magic_tests && $HEADER_BYTES) { |
418 | ## the $magic' one is for when &dodir is not inlined |
419 | $tests = join('||',@magic_tests); |
420 | $MAGIC_TESTS = " { package magic; \$val = ($tests) }"; |
421 | $DO_MAGIC_TESTS = 1; |
422 | } else { |
423 | $MAGIC_TESTS = 1; |
424 | $DO_MAGIC_TESTS = 0; |
425 | } |
426 | |
427 | ## |
428 | ## Prepare regular expressions. |
429 | ## |
430 | { |
431 | local(@regex_tests); |
432 | |
433 | if ($LIST_ONLY) { |
434 | $mflag = ''; |
435 | ## need to have $* set, but perl5 just won''t shut up about it. |
436 | if ($] >= 5) { |
437 | $mflag = 'm'; |
438 | } else { |
439 | eval ' $* = 1 '; |
440 | } |
441 | } |
442 | |
443 | ## |
444 | ## Until I figure out a better way to deal with it, |
445 | ## We have to worry about a regex like [^xyz] when doing $LIST_ONLY. |
446 | ## Such a regex *will* match \n, and if I'm pulling in multiple |
447 | ## lines, it can allow lines to match that would otherwise not match. |
448 | ## |
449 | ## Therefore, if there is a '[^' in a regex, we can NOT take a chance |
450 | ## an use the fast listonly. |
451 | ## |
452 | $CAN_USE_FAST_LISTONLY = $LIST_ONLY; |
453 | |
454 | local(@extra); |
455 | local($underline_glue) = ($] >= 5) ? '(:?_\cH)?' : '(_\cH)?'; |
456 | while (@ARGV) { |
457 | $regex = shift(@ARGV); |
458 | ## |
459 | ## If watching for underlined things too, add another regex. |
460 | ## |
461 | if ($underlineOK) { |
462 | if ($regex =~ m/[?*+{}()\\.|^\$[]/) { |
463 | warn "$0: warning, can't underline-safe ``$regex''.\n"; |
464 | } else { |
465 | $regex = join($underline_glue, split(//, $regex)); |
466 | } |
467 | } |
468 | |
469 | ## If nothing special in the regex, just use index... |
470 | ## is quite a bit faster. |
471 | if (($iflag eq '') && ($words == 0) && |
472 | $regex !~ m/[?*+{}()\\.|^\$[]/) |
473 | { |
474 | push(@regex_tests, "(index(\$_, q+$regex+)>=0)"); |
475 | |
476 | } else { |
477 | $regex =~ s#[\$\@\/]\w#\\$&#; |
478 | if ($words) { |
479 | if ($regex =~ m/\|/) { |
480 | ## could be dangerous -- see if we can wrap in parens. |
481 | if ($regex =~ m/\\\d/) { |
482 | warn "warning: -w and a | in a regex is dangerous.\n" |
483 | } else { |
484 | $regex = join($regex, '(', ')'); |
485 | } |
486 | } |
487 | $regex = join($regex, '\b', '\b'); |
488 | } |
489 | $CAN_USE_FAST_LISTONLY = 0 if substr($regex, "[^") >= 0; |
490 | push(@regex_tests, "m/$regex/$iflag$mflag"); |
491 | } |
492 | |
493 | ## If we're done, but still have @extra to do, get set for that. |
494 | if (@ARGV == 0 && @extra) { |
495 | @ARGV = @extra; ## now deal with the extra stuff. |
496 | $underlineOK = 0; ## but no more of this. |
497 | undef @extra; ## or this. |
498 | } |
499 | } |
500 | if (@regex_tests) { |
501 | $REGEX_TEST = join('||', @regex_tests); |
502 | ## print STDERR $REGEX_TEST, "\n"; exit; |
503 | } else { |
504 | ## must be doing -find -- just give something syntactically correct. |
505 | $REGEX_TEST = 1; |
506 | } |
507 | } |
508 | |
509 | ## |
510 | ## Make sure we can read the first item(s). |
511 | ## |
512 | foreach $start (@todo) { |
513 | $! = 2, die qq/$0: can't stat "$start"\n/ |
514 | unless ($dev,$inode) = (stat($start))[$STAT_DEV,$STAT_INODE]; |
515 | |
516 | if (defined $dir_done{"$dev,$inode"}) { |
517 | ## ignore the repeat. |
518 | warn(qq/ignoring "$start" (same as "$dir_done{"$dev,$inode"}").\n/) |
519 | if $VERBOSE; |
520 | next; |
521 | } |
522 | |
523 | ## if -xdev was given, remember the device. |
524 | $xdev{$dev} = 1 if $XDEV; |
525 | |
526 | ## Note that we won't want to do it again |
527 | $dir_done{"$dev,$inode"} = $start; |
528 | } |
529 | } |
530 | |
531 | |
532 | ## |
533 | ## See the comment above the __END__ above the 'sub dodir' below. |
534 | ## |
535 | sub import_program |
536 | { |
537 | sub bad { |
538 | print STDERR "$0: internal error (@_)\n"; |
539 | exit 2; |
540 | } |
541 | |
542 | ## Read from data, up to next __END__. This will be &dodir. |
543 | local($/) = "\n__END__"; |
544 | $prog = <DATA>; |
545 | close(DATA); |
546 | |
547 | $prog =~ s/\beval\b//g; ## remove any 'eval' |
548 | |
549 | ## Inline uppercase $-variables by their current values. |
550 | if ($] >= 5) { |
551 | $prog =~ s/\$([A-Z][A-Z0-9_]{2,}\b)/ |
552 | &bad($1) if !defined ${$main::{$1}}; ${$main::{$1}};/eg; |
553 | } else { |
554 | $prog =~ s/\$([A-Z][A-Z0-9_]{2,}\b)/local(*VAR) = $_main{$1}; |
555 | &bad($1) if !defined $VAR; $VAR;/eg; |
556 | } |
557 | |
558 | eval $prog; ## now do it. This will define &dodir; |
559 | $!=2, die "$0 internal error: $@\n" if $@; |
560 | } |
561 | |
562 | ########################################################################### |
563 | |
564 | ## |
565 | ## Read the .search file: |
566 | ## Blank lines and lines that are only #-comments ignored. |
567 | ## Newlines may be escaped to create long lines |
568 | ## Other lines are directives. |
569 | ## |
570 | ## A directive may begin with an optional tag in the form <...> |
571 | ## Things inside the <...> are evaluated as with: |
572 | ## <(this || that) && must> |
573 | ## will be true if |
574 | ## -xmust -xthis or -xmust -xthat |
575 | ## were specified on the command line (order doesn't matter, though) |
576 | ## A directive is not done if there is a tag and it's false. |
577 | ## Any characters but whitespace and &|()>,! may appear after an -x |
578 | ## (although "-xdev" is special). -xmust,this is the same as -xmust -xthis. |
579 | ## Something like -x~ would make <~> true, and <!~> false. |
580 | ## |
581 | ## Directives are in the form: |
582 | ## option: STRING |
583 | ## magic : NUMBYTES : EXPR |
584 | ## |
585 | ## With option: |
586 | ## The STRING is parsed like a Bourne shell command line, and the |
587 | ## options are used as if given on the command line. |
588 | ## No comments are allowed on 'option' lines. |
589 | ## Examples: |
590 | ## # skip objects and libraries |
591 | ## option: -skip '.o .a' |
592 | ## # skip emacs *~ and *# files, unless -x~ given: |
593 | ## <!~> option: -skip '~ #' |
594 | ## |
595 | ## With magic: |
596 | ## EXPR can be pretty much any perl (comments allowed!). |
597 | ## If it evaluates to true for any particular file, it is skipped. |
598 | ## The only info you'll have about a file is the variable $H, which |
599 | ## will have at least the first NUMBYTES of the file (less if the file |
600 | ## is shorter than that, of course, and maybe more). You'll also have |
601 | ## any variables you set in previous 'magic' lines. |
602 | ## Examples: |
603 | ## magic: 6 : ($x6 = substr($H, 0, 6)) eq 'GIF87a' |
604 | ## magic: 6 : $x6 eq 'GIF89a' |
605 | ## |
606 | ## magic: 6 : (($x6 = substr($H, 0, 6)) eq 'GIF87a' ## old gif \ |
607 | ## || $x6 eq 'GIF89a' ## new gif |
608 | ## (the above two sets are the same) |
609 | ## ## Check the first 32 bytes for "binarish" looking bytes. |
610 | ## ## Don't blindly dump on any high-bit set, as non-ASCII text |
611 | ## ## often has them set. \x80 and \xff seem to be special, though. |
612 | ## ## Require two in a row to not get things like perl's $^T. |
613 | ## ## This is known to get *.Z, *.gz, pkzip, *.elc and about any |
614 | ## ## executable you'll find. |
615 | ## magic: 32 : $H =~ m/[\x00-\x06\x10-\x1a\x1c-\x1f\x80\xff]{2}/ |
616 | ## |
617 | sub read_rc |
618 | { |
619 | local($file, $show) = @_; |
620 | local($line_num, $ln, $tag) = 0; |
621 | local($use_default, @default) = 0; |
622 | |
623 | { package magic; $\17 = 0; } ## turn off warnings for when we run EXPR's |
624 | |
625 | unless (open(RC, "$file")) { |
626 | $use_default=1; |
627 | $file = "<internal default startup file>"; |
628 | ## no RC file -- use this default. |
629 | @default = split(/\n/,<<'--------INLINE_LITERAL_TEXT'); |
630 | magic: 32 : $H =~ m/[\x00-\x06\x10-\x1a\x1c-\x1f\x80\xff]{2}/ |
631 | option: -skip '.a .COM .elc .EXE .gz .o .pbm .xbm .dvi' |
632 | option: -iskip '.tarz .zip .z .lzh .jpg .jpeg .gif .uu' |
633 | <!~> option: -skip '~ #' |
634 | --------INLINE_LITERAL_TEXT |
635 | } |
636 | |
637 | ## |
638 | ## Make an eval error pretty. |
639 | ## |
640 | sub clean_eval_error { |
641 | local($_) = @_; |
642 | s/ in file \(eval\) at line \d+,//g; ## perl4-style error |
643 | s/ at \(eval \d+\) line \d+,//g; ## perl5-style error |
644 | $_ = $` if m/\n/; ## remove all but first line |
645 | "$_\n"; |
646 | } |
647 | |
648 | print "reading RC file: $file\n" if $show; |
649 | |
650 | while (defined($_ = ($use_default ? shift(@default) : <RC>))) { |
651 | $ln = ++$line_num; ## note starting line num. |
652 | $_ .= <RC>, $line_num++ while s/\\\n?$/\n/; ## allow continuations |
653 | next if /^\s*(#.*)?$/; ## skip blank or comment-only lines. |
654 | $do = ''; |
655 | |
656 | ## look for an initial <...> tag. |
657 | if (s/^\s*<([^>]*)>//) { |
658 | ## This simple s// will make the tag ready to eval. |
659 | ($tag = $msg = $1) =~ |
660 | s/[^\s&|(!)]+/ |
661 | $seen_opt{$&}=1; ## note seen option |
662 | "defined(\$opt{q>$&>})" ## (q>> is safe quoting here) |
663 | /eg; |
664 | |
665 | ## see if the tag is true or not, abort this line if not. |
666 | $dothis = (eval $tag); |
667 | $!=2, die "$file $ln <$msg>: $_".&clean_eval_error($@) if $@; |
668 | |
669 | if ($show) { |
670 | $msg =~ s/[^\s&|(!)]+/-x$&/; |
671 | $msg =~ s/\s*!\s*/ no /g; |
672 | $msg =~ s/\s*&&\s*/ and /g; |
673 | $msg =~ s/\s*\|\|\s*/ or /g; |
674 | $msg =~ s/^\s+//; $msg =~ s/\s+$//; |
675 | $do = $dothis ? "(doing because $msg)" : |
676 | "(do if $msg)"; |
677 | } elsif (!$dothis) { |
678 | next; |
679 | } |
680 | } |
681 | |
682 | if (m/^\s*option\s*:\s*/) { |
683 | next if $all && !$show; ## -all turns off these checks; |
684 | local($_) = $'; |
685 | s/\n$//; |
686 | local($orig) = $_; |
687 | print " $do option: $_\n" if $show; |
688 | local($0) = "$0 ($file)"; ## for any error message. |
689 | local(@ARGV); |
690 | local($this); |
691 | ## |
692 | ## Parse $_ as a Bourne shell line -- fill @ARGV |
693 | ## |
694 | while (length) { |
695 | if (s/^\s+//) { |
696 | push(@ARGV, $this) if defined $this; |
697 | undef $this; |
698 | next; |
699 | } |
700 | $this = '' if !defined $this; |
701 | $this .= $1 while s/^'([^']*)'// || |
702 | s/^"([^"]*)"// || |
703 | s/^([^'"\s\\]+)//|| |
704 | s/^(\\[\D\d])//; |
705 | die "$file $ln: error parsing $orig at $_\n" if m/^\S/; |
706 | } |
707 | push(@ARGV, $this) if defined $this; |
708 | &check_args; |
709 | die qq/$file $ln: unused arg "@ARGV".\n/ if @ARGV; |
710 | next; |
711 | } |
712 | |
713 | if (m/^\s*magic\s*:\s*(\d+)\s*:\s*/) { |
714 | next if $all && !$show; ## -all turns off these checks; |
715 | local($bytes, $check) = ($1, $'); |
716 | |
717 | if ($show) { |
718 | $check =~ s/\n?$/\n/; |
719 | print " $do contents: $check"; |
720 | } |
721 | ## Check to make sure the thing at least compiles. |
722 | eval "package magic; (\$H = '1'x \$main'bytes) && (\n$check\n)\n"; |
723 | $! = 2, die "$file $ln: ".&clean_eval_error($@) if $@; |
724 | |
725 | $HEADER_BYTES = $bytes if $bytes > $HEADER_BYTES; |
726 | push(@magic_tests, "(\n$check\n)"); |
727 | next; |
728 | } |
729 | $! = 2, die "$file $ln: unknown command\n"; |
730 | } |
731 | close(RC); |
732 | } |
733 | |
734 | sub message |
735 | { |
736 | if (!$STDERR_IS_TTY) { |
737 | print STDERR $_[0], "\n"; |
738 | } else { |
739 | local($text) = @_; |
740 | $thislength = length($text); |
741 | if ($thislength >= $last_message_length) { |
742 | print STDERR $text, "\r"; |
743 | } else { |
744 | print STDERR $text, ' 'x ($last_message_length-$thislength),"\r"; |
745 | } |
746 | $last_message_length = $thislength; |
747 | } |
748 | } |
749 | |
750 | sub clear_message |
751 | { |
752 | print STDERR ' ' x $last_message_length, "\r" if $last_message_length; |
753 | $vv_print = $vv_size = $last_message_length = 0; |
754 | } |
755 | |
756 | ## |
757 | ## Output a copy of this program with comments, extra whitespace, and |
758 | ## the trailing man page removed. On an ultra slow machine, such a copy |
759 | ## might load faster (but I can't tell any difference on my machine). |
760 | ## |
761 | sub strip { |
762 | seek(DATA, 0, 0) || die "$0: can't reset internal pointer.\n"; |
763 | while(<DATA>) { |
764 | print, next if /INLINE_LITERAL_TEXT/.../INLINE_LITERAL_TEXT/; |
765 | ## must mention INLINE_LITERAL_TEXT on this line! |
766 | s/\#\#.*|^\s+|\s+$//; ## remove cruft |
767 | last if $_ eq '.00;'; |
768 | next if ($_ eq '') || ($_ eq "'di'") || ($_ eq "'ig00'"); |
769 | s/\$stripped=0;/\$stripped=1;/; |
770 | s/\s\s+/ /; ## squish multiple whitespaces down to one. |
771 | print $_, "\n"; |
772 | } |
773 | exit(0); |
774 | } |
775 | |
776 | ## |
777 | ## Just to shut up -w. Never executed. |
778 | ## |
779 | sub dummy { |
780 | |
781 | 1 || &dummy || &dir_done || &bad || &message || $NEXT_DIR_ENTRY || |
782 | $DELAY || $VV_SIZE || $VV_PRINT_COUNT || $STDERR_SCREWS_STDOUT || |
783 | @files || @files || $magic'H || $magic'H || $xdev{''} || &clear_message; |
784 | |
785 | } |
786 | |
787 | ## |
788 | ## If the following __END__ is in place, what follows will be |
789 | ## inlined when the program first starts up. Any $ variable name |
790 | ## all in upper case, specifically, any string matching |
791 | ## \$([A-Z][A-Z0-9_]{2,}\b |
792 | ## will have the true value for that variable inlined. Also, any 'eval' is |
793 | ## removed |
794 | ## |
795 | ## The idea is that when the whole thing is then eval'ed to define &dodir, |
796 | ## the perl optimizer will make all the decisions that are based upon |
797 | ## command-line options (such as $VERBOSE), since they'll be inlined as |
798 | ## constants |
799 | ## |
800 | ## Also, and here's the big win, the tests for matching the regex, and a |
801 | ## few others, are all inlined. Should be blinding speed here. |
802 | ## |
803 | ## See the read from <DATA> above for where all this takes place. |
804 | ## But all-in-all, you *want* the __END__ here. Comment it out only for |
805 | ## debugging.... |
806 | ## |
807 | |
808 | __END__ |
809 | |
810 | ## |
811 | ## Given a directory, check all "appropriate" files in it. |
812 | ## Shove any subdirectories into the global @todo, so they'll be done |
813 | ## later. |
814 | ## |
815 | ## Be careful about adding any upper-case variables, as they are subject |
816 | ## to being inlined. See comments above the __END__ above. |
817 | ## |
818 | sub dodir |
819 | { |
820 | local($dir) = @_; |
821 | $dir =~ s,/+$,,; ## remove any trailing slash. |
822 | unless (opendir(DIR, "$dir/.")) { |
823 | &clear_message if $VERBOSE && $STDERR_SCREWS_STDOUT; |
824 | warn qq($0: can't opendir "$dir/".\n); |
825 | return; |
826 | } |
827 | |
828 | if ($VERBOSE) { |
829 | &message($dir); |
830 | $vv_print = $vv_size = 0; |
831 | } |
832 | |
833 | @files = sort readdir(DIR) if $DO_SORT; |
834 | |
835 | while (defined($name = eval $NEXT_DIR_ENTRY)) |
836 | { |
837 | next if $name eq '.' || $name eq '..'; ## never follow these. |
838 | |
839 | ## create full relative pathname. |
840 | $file = $dir eq '.' ? $name : "$dir/$name"; |
841 | |
842 | ## if link and skipping them, do so. |
843 | if ($NOLINKS && -l $file) { |
844 | warn qq/skip (symlink): $file\n/ if $WHY; |
845 | next; |
846 | } |
847 | |
848 | ## skip things unless files or directories |
849 | unless (-f $file || -d _) { |
850 | if ($WHY) { |
851 | $why = (-S _ && "socket") || |
852 | (-p _ && "pipe") || |
853 | (-b _ && "block special")|| |
854 | (-c _ && "char special") || "somekinda special"; |
855 | warn qq/skip ($why): $file\n/; |
856 | } |
857 | next; |
858 | } |
859 | |
860 | ## skip things we can't read |
861 | unless (-r _) { |
862 | if ($WHY) { |
863 | $why = (-l $file) ? "follow" : "read"; |
864 | warn qq/skip (can't $why): $file\n/; |
865 | } |
866 | next; |
867 | } |
868 | |
869 | ## skip things that are empty |
870 | unless (-s _) { |
871 | warn qq/skip (empty): $file\n/ if $WHY; |
872 | next; |
873 | } |
874 | |
875 | ## Note file device & inode. If -xdev, skip if appropriate. |
876 | ($dev, $inode) = (stat(_))[$STAT_DEV, $STAT_INODE]; |
877 | if ($XDEV && defined $xdev{$dev}) { |
878 | warn qq/skip (other device): $file\n/ if $WHY; |
879 | next; |
880 | } |
881 | $id = "$dev,$inode"; |
882 | |
883 | ## special work for a directory |
884 | if (-d _) { |
885 | ## Do checks for directory file endings. |
886 | if ($DO_DSKIP_TEST && (eval $DSKIP_TEST)) { |
887 | warn qq/skip (-dskip): $file\n/ if $WHY; |
888 | next; |
889 | } |
890 | ## do checks for -name/-regex/-path tests |
891 | if ($DO_DGLOB_TESTS && !(eval $DGLOB_TESTS)) { |
892 | warn qq/skip (dirname): $file\n/ if $WHY; |
893 | next; |
894 | } |
895 | |
896 | ## _never_ redo a directory |
897 | if (defined $dir_done{$id}) { |
898 | warn qq/skip (did as "$dir_done{$id}"): $file\n/ if $WHY; |
899 | next; |
900 | } |
901 | $dir_done{$id} = $file; ## mark it done. |
902 | unshift(@todo, $file); ## add to the list to do. |
903 | next; |
904 | } |
905 | if ($WHY == 0 && $VERBOSE > 1) { |
906 | if ($VERBOSE>2||$vv_print++>$VV_PRINT_COUNT||($vv_size+=-s _)>$VV_SIZE){ |
907 | &message($file); |
908 | $vv_print = $vv_size = 0; |
909 | } |
910 | } |
911 | |
912 | ## do time-related tests |
913 | if ($NEWER || $OLDER) { |
914 | $_ = (stat(_))[$STAT_MTIME]; |
915 | if ($NEWER && $_ < $NEWER) { |
916 | warn qq/skip (too old): $file\n/ if $WHY; |
917 | next; |
918 | } |
919 | if ($OLDER && $_ > $OLDER) { |
920 | warn qq/skip (too new): $file\n/ if $WHY; |
921 | next; |
922 | } |
923 | } |
924 | |
925 | ## do checks for file endings |
926 | if ($DO_SKIP_TEST && (eval $SKIP_TEST)) { |
927 | warn qq/skip (-skip): $file\n/ if $WHY; |
928 | next; |
929 | } |
930 | |
931 | ## do checks for -name/-regex/-path tests |
932 | if ($DO_GLOB_TESTS && !(eval $GLOB_TESTS)) { |
933 | warn qq/skip (filename): $file\n/ if $WHY; |
934 | next; |
935 | } |
936 | |
937 | |
938 | ## If we're not repeating files, |
939 | ## skip this one if we've done it, or note we're doing it. |
940 | unless ($DOREP) { |
941 | if (defined $file_done{$id}) { |
942 | warn qq/skip (did as "$file_done{$id}"): $file\n/ if $WHY; |
943 | next; |
944 | } |
945 | $file_done{$id} = $file; |
946 | } |
947 | |
948 | if ($DO_MAGIC_TESTS) { |
949 | if (!open(FILE_IN, $file)) { |
950 | &clear_message if $VERBOSE && $STDERR_SCREWS_STDOUT; |
951 | warn qq/$0: can't open: $file\n/; |
952 | next; |
953 | } |
954 | unless (read(FILE_IN, $magic'H, $HEADER_BYTES)) { |
955 | &clear_message if $VERBOSE && $STDERR_SCREWS_STDOUT; |
956 | warn qq/$0: can't read from "$file"\n"/; |
957 | close(FILE_IN); |
958 | next; |
959 | } |
960 | |
961 | eval $MAGIC_TESTS; |
962 | if ($magic'val) { |
963 | close(FILE_IN); |
964 | warn qq/skip (magic): $file\n/ if $WHY; |
965 | next; |
966 | } |
967 | seek(FILE_IN, 0, 0); ## reset for later <FILE_IN> |
968 | } |
969 | |
970 | if ($WHY != 0 && $VERBOSE > 1) { |
971 | if ($VERBOSE>2||$vv_print++>$VV_PRINT_COUNT||($vv_size+=-s _)>$VV_SIZE){ |
972 | &message($file); |
973 | $vv_print = $vv_size = 0; |
974 | } |
975 | } |
976 | |
977 | if ($DELAY) { |
978 | sleep($DELAY); |
979 | } |
980 | |
981 | if ($FIND_ONLY) { |
982 | &clear_message if $VERBOSE && $STDERR_SCREWS_STDOUT; |
983 | print $file, "\n"; |
984 | $retval=0; ## we've found something |
985 | close(FILE_IN) if $DO_MAGIC_TESTS; |
986 | next; |
987 | } else { |
988 | ## if we weren't doing magic tests, file won't be open yet... |
989 | if (!$DO_MAGIC_TESTS && !open(FILE_IN, $file)) { |
990 | &clear_message if $VERBOSE && $STDERR_SCREWS_STDOUT; |
991 | warn qq/$0: can't open: $file\n/; |
992 | next; |
993 | } |
994 | if ($LIST_ONLY && $CAN_USE_FAST_LISTONLY) { |
995 | ## |
996 | ## This is rather complex, but buys us a LOT when we're just |
997 | ## listing files and not the individual internal lines. |
998 | ## |
999 | local($size) = 4096; ## block-size in which to do reads |
1000 | local($nl); ## will point to $_'s ending newline. |
1001 | local($read); ## will be how many bytes read. |
1002 | local($_) = ''; ## Starts out empty |
1003 | local($hold); ## (see below) |
1004 | |
1005 | while (($read = read(FILE_IN,$_,$size,length($_)))||length($_)) |
1006 | { |
1007 | undef @parts; |
1008 | ## if read a full block, but no newline, need to read more. |
1009 | while ($read == $size && ($nl = rindex($_, "\n")) < 0) { |
1010 | push(@parts, $_); ## save that part |
1011 | $read = read(FILE_IN, $_, $size); ## keep trying |
1012 | } |
1013 | |
1014 | ## |
1015 | ## If we had to save parts, must now combine them together. |
1016 | ## adjusting $nl to reflect the now-larger $_. This should |
1017 | ## be a lot more efficient than using any kind of .= in the |
1018 | ## loop above. |
1019 | ## |
1020 | if (@parts) { |
1021 | local($lastlen) = length($_); #only need if $nl >= 0 |
1022 | $_ = join('', @parts, $_); |
1023 | $nl = length($_) - ($lastlen - $nl) if $nl >= 0; |
1024 | } |
1025 | |
1026 | ## |
1027 | ## If we're at the end of the file, then we can use $_ as |
1028 | ## is. Otherwise, we need to remove the final partial-line |
1029 | ## and save it so that it'll be at the beginning of the |
1030 | ## next read (where the rest of the line will be layed in |
1031 | ## right after it). $hold will be what we should save |
1032 | ## until next time. |
1033 | ## |
1034 | if ($read != $size || $nl < 0) { |
1035 | $hold = ''; |
1036 | } else { |
1037 | $hold = substr($_, $nl + 1); |
1038 | substr($_, $nl + 1) = ''; |
1039 | } |
1040 | |
1041 | ## |
1042 | ## Now have a bunch of full lines in $_. Use it. |
1043 | ## |
1044 | if (eval $REGEX_TEST) { |
1045 | &clear_message if $VERBOSE && $STDERR_SCREWS_STDOUT; |
1046 | print $file, "\n"; |
1047 | $retval=0; ## we've found something |
1048 | |
1049 | last; |
1050 | } |
1051 | |
1052 | ## Prepare for next read.... |
1053 | $_ = $hold; |
1054 | } |
1055 | |
1056 | } else { ## else not using faster block scanning..... |
1057 | |
1058 | $lines_printed = 0 if $NICE; |
1059 | while (<FILE_IN>) { |
1060 | study; |
1061 | next unless (eval $REGEX_TEST); |
1062 | |
1063 | ## |
1064 | ## We found a matching line. |
1065 | ## |
1066 | $retval=0; |
1067 | &clear_message if $VERBOSE && $STDERR_SCREWS_STDOUT; |
1068 | if ($LIST_ONLY) { |
1069 | print $file, "\n"; |
1070 | last; |
1071 | } else { |
1072 | ## prepare to print line. |
1073 | if ($NICE && $lines_printed++ == 0) { |
1074 | print '-' x 70, "\n" if $NICE > 1; |
1075 | print $file, ":\n"; |
1076 | } |
1077 | |
1078 | ## |
1079 | ## Print all the prelim stuff. This looks less efficient |
1080 | ## than it needs to be, but that's so that when the eval |
1081 | ## is compiled (and the tests are optimized away), the |
1082 | ## result will be less actual PRINTs than the more natural |
1083 | ## way of doing these tests.... |
1084 | ## |
1085 | if ($NICE) { |
1086 | if ($REPORT_LINENUM) { |
1087 | print " line $.: "; |
1088 | } else { |
1089 | print " "; |
1090 | } |
1091 | } elsif ($REPORT_LINENUM && $PREPEND_FILENAME) { |
1092 | print "$file,:$.: "; |
1093 | } elsif ($PREPEND_FILENAME) { |
1094 | print "$file: "; |
1095 | } elsif ($REPORT_LINENUM) { |
1096 | print "$.: "; |
1097 | } |
1098 | print $_; |
1099 | print "\n" unless m/\n$/; |
1100 | } |
1101 | } |
1102 | print "\n" if ($NICE > 1) && $lines_printed; |
1103 | } |
1104 | close(FILE_IN); |
1105 | } |
1106 | } |
1107 | closedir(DIR); |
1108 | } |
1109 | |
1110 | __END__ |
1111 | .00; ## finish .ig |
1112 | |
1113 | 'di \" finish diversion--previous line must be blank |
1114 | .nr nl 0-1 \" fake up transition to first page again |
1115 | .nr % 0 \" start at page 1 |
1116 | .\"__________________NORMAL_MAN_PAGE_BELOW_________________ |
1117 | .ll+10n |
1118 | .TH search 1 "Dec 17, 1994" |
1119 | .SH SEARCH |
1120 | search \- search files (a'la grep) in a whole directory tree. |
1121 | .SH SYNOPSIS |
1122 | search [ grep-like and find-like options] [regex ....] |
1123 | .SH DESCRIPTION |
1124 | .I Search |
1125 | is more or less a combo of 'find' and 'grep' (although the regular |
1126 | expression flavor is that of the perl being used, which is closer to |
1127 | egrep's than grep's). |
1128 | |
1129 | .I Search |
1130 | does generally the same kind of thing that |
1131 | .nf |
1132 | find <blah blah> | xargs egrep <blah blah> |
1133 | .fi |
1134 | does, but is |
1135 | .I much |
1136 | more powerful and efficient (and intuitive, I think). |
1137 | |
1138 | This manual describes |
1139 | .I search |
1140 | as of version "941227.4". You can always find the latest version at |
1141 | .nf |
1142 | http://www.wg.omron.co.jp/~jfriedl/perl/index.html |
1143 | .fi |
1144 | |
1145 | .SH "QUICK EXAMPLE" |
1146 | Basic use is simple: |
1147 | .nf |
1148 | % search jeff |
1149 | .fi |
1150 | will search files in the current directory, and all sub directories, for |
1151 | files that have "jeff" in them. The lines will be listed with the |
1152 | containing file's name prepended. |
1153 | .PP |
1154 | If you list more than one regex, such as with |
1155 | .nf |
1156 | % search jeff Larry Randal+ 'Stoc?k' 'C.*son' |
1157 | .fi |
1158 | then a line containing any of the regexes will be listed. |
1159 | This makes it effectively the same as |
1160 | .nf |
1161 | % search 'jeff|Larry|Randal+|Stoc?k|C.*son' |
1162 | .fi |
1163 | However, listing them separately is much more efficient (and is easier |
1164 | to type). |
1165 | .PP |
1166 | Note that in the case of these examples, the |
1167 | .B \-w |
1168 | (list whole-words only) option would be useful. |
1169 | .PP |
1170 | Normally, various kinds of files are automatically removed from consideration. |
1171 | If it has has a certain ending (such as ".tar", ".Z", ".o", .etc), or if |
1172 | the beginning of the file looks like a binary, it'll be excluded. |
1173 | You can control exactly how this works -- see below. One quick way to |
1174 | override this is to use the |
1175 | .B \-all |
1176 | option, which means to consider all the files that would normally be |
1177 | automatically excluded. |
1178 | Or, if you're curious, you can use |
1179 | .B \-why |
1180 | to have notes about what files are skipped (and why) printed to stderr. |
1181 | |
1182 | .SH "BASIC OVERVIEW" |
1183 | Normally, the search starts in the current directory, considering files in |
1184 | all subdirectories. |
1185 | |
1186 | You can use the |
1187 | .I ~/.search |
1188 | file to control ways to automatically exclude files. |
1189 | If you don't have this file, a default one will kick in, which automatically |
1190 | add |
1191 | .nf |
1192 | -skip .o .Z .gif |
1193 | .fi |
1194 | (among others) to exclude those kinds of files (which you probably want to |
1195 | skip when searching for text, as is normal). |
1196 | Files that look to be be binary will also be excluded. |
1197 | |
1198 | Files ending with "#" and "~" will also be excluded unless the |
1199 | .B -x~ |
1200 | option is given. |
1201 | |
1202 | You can use |
1203 | .B -showrc |
1204 | to show what kinds of files will normally be skipped. |
1205 | See the section on the startup file |
1206 | for more info. |
1207 | |
1208 | You can use the |
1209 | .B -all |
1210 | option to indicate you want to consider all files that would otherwise be |
1211 | skipped by the startup file. |
1212 | |
1213 | Based upon various other flags (see "WHICH FILES TO CONSIDER" below), |
1214 | more files might be removed from consideration. For example |
1215 | .nf |
1216 | -mtime 3 |
1217 | .fi |
1218 | will exclude files that aren't at least three days old (change the 3 to -3 |
1219 | to exclude files that are more than three days old), while |
1220 | .nf |
1221 | -skip .* |
1222 | .fi |
1223 | would exclude any file beginning with a dot (of course, '.' and '..' are |
1224 | special and always excluded). |
1225 | |
1226 | If you'd like to see what files are being excluded, and why, you can get the |
1227 | list via the |
1228 | .B \-why |
1229 | option. |
1230 | |
1231 | If a file makes it past all the checks, it is then "considered". |
1232 | This usually means it is greped for the regular expressions you gave |
1233 | on the command line. |
1234 | |
1235 | If any of the regexes match a line, the line is printed. |
1236 | However, if |
1237 | .B -list |
1238 | is given, just the filename is printed. Or, if |
1239 | .B -nice |
1240 | is given, a somewhat more (human-)readable output is generated. |
1241 | |
1242 | If you're searching a huge tree and want to keep informed about how |
1243 | the search is progressing, |
1244 | .B -v |
1245 | will print (to stderr) the current directory being searched. |
1246 | Using |
1247 | .B -vv |
1248 | will also print the current file "every so often", which could be useful |
1249 | if a directory is huge. Using |
1250 | .B -vvv |
1251 | will print the update with every file. |
1252 | |
1253 | Below is the full listing of options. |
1254 | |
1255 | .SH "OPTIONS TELLING *WHERE* TO SEARCH" |
1256 | .TP |
1257 | .BI -dir " DIR" |
1258 | Start searching at the named directory instead of the current directory. |
1259 | If multiple |
1260 | .B -dir |
1261 | arguments are given, multiple trees will be searched. |
1262 | .TP |
1263 | .BI -ddir " DIR" |
1264 | Like |
1265 | .B -dir |
1266 | except it flushes any previous |
1267 | .B -dir |
1268 | directories (i.e. "-dir A -dir B -dir C" will search A, B, and C, while |
1269 | "-dir A -ddir B -dir C" will search only B and C. This might be of use |
1270 | in the startup file (see that section below). |
1271 | .TP |
1272 | .B -xdev |
1273 | Stay on the same filesystem as the starting directory/directories. |
1274 | .TP |
1275 | .B -sort |
1276 | Sort the items in a directory before processing them. |
1277 | Normally they are processed in whatever order they happen to be read from |
1278 | the directory. |
1279 | .TP |
1280 | .B -nolinks |
1281 | Don't follow symbolic links. Normally they're followed. |
1282 | |
1283 | .SH "OPTIONS CONTROLLING WHICH FILES TO CONSIDER AND EXCLUDE" |
1284 | .TP |
1285 | .BI -mtime " NUM" |
1286 | Only consider files that were last changed more than |
1287 | .I NUM |
1288 | days ago |
1289 | (less than |
1290 | .I NUM |
1291 | days if |
1292 | .I NUM |
1293 | has '-' prepended, i.e. "-mtime -2.5" means to consider files that |
1294 | have been changed in the last two and a half days). |
1295 | .TP |
1296 | .B -older FILE |
1297 | Only consider files that have not changed since |
1298 | .I FILE |
1299 | was last changed. |
1300 | If there is any upper case in the "-older", "or equal" is added to the sense |
1301 | of the test. Therefore, "search -older ./file regex" will never consider |
1302 | "./file", while "search -Older ./file regex" will. |
1303 | |
1304 | If a file is a symbolic link, the time used is that of the file and not the |
1305 | link. |
1306 | .TP |
1307 | .BI -newer " FILE" |
1308 | Opposite of |
1309 | .BR -older . |
1310 | .TP |
1311 | .BI -name " GLOB" |
1312 | Only consider files that match the shell filename pattern |
1313 | .IR GLOB . |
1314 | The check is only done on a file's name (use |
1315 | .B -path |
1316 | to check the whole path, and use |
1317 | .B -dname |
1318 | to check directory names). |
1319 | |
1320 | Multiple specifications can be given by separating them with spaces, a'la |
1321 | .nf |
1322 | -name '*.c *.h' |
1323 | .fi |
1324 | to consider C source and header files. |
1325 | If |
1326 | .I GLOB |
1327 | doesn't contain any special pattern characters, a '*' is prepended. |
1328 | This last example could have been given as |
1329 | .nf |
1330 | -name '.c .h' |
1331 | .fi |
1332 | It could also be given as |
1333 | .nf |
1334 | -name .c -name .h |
1335 | .fi |
1336 | or |
1337 | .nf |
1338 | -name '*.c' -name '*.h' |
1339 | .fi |
1340 | or |
1341 | .nf |
1342 | -name '*.[ch]' |
1343 | .fi |
1344 | (among others) |
1345 | but in this last case, you have to be sure to supply the leading '*'. |
1346 | .TP |
1347 | .BI -path " GLOB" |
1348 | Like |
1349 | .B -name |
1350 | except the entire path is checked against the pattern. |
1351 | .TP |
1352 | .B -regex " REGEX" |
1353 | Considers files whose names (not paths) match the given perl regex |
1354 | exactly. |
1355 | .TP |
1356 | .BI -iname " GLOB" |
1357 | Case-insensitive version of |
1358 | .BR -name . |
1359 | .TP |
1360 | .BI -ipath " GLOB" |
1361 | Case-insensitive version of |
1362 | .BR -path . |
1363 | .TP |
1364 | .BI -iregex " REGEX" |
1365 | Case-insensitive version of |
1366 | .BR -regex . |
1367 | |
1368 | .TP |
1369 | .BI -dpath " GLOB" |
1370 | Only search down directories whose path matches the given pattern (this |
1371 | doesn't apply to the initial directory given by |
1372 | .BI -dir , |
1373 | of course). |
1374 | Something like |
1375 | .nf |
1376 | -dir /usr/man -dpath /usr/man/man* |
1377 | .fi |
1378 | would completely skip |
1379 | "/usr/man/cat1", "/usr/man/cat2", etc. |
1380 | .TP |
1381 | .BI -dskip " GLOB" |
1382 | Skips directories whose name (not path) matches the given pattern. |
1383 | Something like |
1384 | .nf |
1385 | -dir /usr/man -dskip cat* |
1386 | .fi |
1387 | would completely skip any directory in the tree whose name begins with "cat" |
1388 | (including "/usr/man/cat1", "/usr/man/cat2", etc.). |
1389 | .TP |
1390 | .BI -dregex " REGEX" |
1391 | Like |
1392 | .BI -dpath , |
1393 | but the pattern is a full perl regex. Note that this quite different |
1394 | from |
1395 | .B -regex |
1396 | which considers only file names (not paths). This option considers |
1397 | full directory paths (not just names). It's much more useful this way. |
1398 | Sorry if it's confusing. |
1399 | .TP |
1400 | .BI -dpath " GLOB" |
1401 | This option exists, but is probably not very useful. It probably wants to |
1402 | be like the '-below' or something I mention in the "TODO" section. |
1403 | .TP |
1404 | .BI -idpath " GLOB" |
1405 | Case-insensitive version of |
1406 | .BR -dpath . |
1407 | .TP |
1408 | .BI -idskip " GLOB" |
1409 | Case-insensitive version of |
1410 | .BR -dskip . |
1411 | .TP |
1412 | .BI -idregex " REGEX" |
1413 | Case-insensitive version of |
1414 | .BR -dregex . |
1415 | .TP |
1416 | .B -all |
1417 | Ignore any 'magic' or 'option' lines in the startup file. |
1418 | The effect is that all files that would otherwise be automatically |
1419 | excluded are considered. |
1420 | .TP |
1421 | .BI -x SPECIAL |
1422 | Arguments starting with |
1423 | .B -x |
1424 | (except |
1425 | .BR -xdev , |
1426 | explained elsewhere) do special interaction with the |
1427 | .I ~/.search |
1428 | startup file. Something like |
1429 | .nf |
1430 | -xflag1 -xflag2 |
1431 | .fi |
1432 | will turn on "flag1" and "flag2" in the startup file (and is |
1433 | the same as "-xflag1,flag2"). You can use this to write your own |
1434 | rules for what kinds of files are to be considered. |
1435 | |
1436 | For example, the internal-default startup file contains the line |
1437 | .nf |
1438 | <!~> option: -skip '~ #' |
1439 | .fi |
1440 | This means that if the |
1441 | .B -x~ |
1442 | flag is |
1443 | .I not |
1444 | seen, the option |
1445 | .nf |
1446 | -skip '~ #' |
1447 | .fi |
1448 | should be done. |
1449 | The effect is that emacs temp and backup files are not normally |
1450 | considered, but you can included them with the -x~ flag. |
1451 | |
1452 | You can write your own rules to customize |
1453 | .I search |
1454 | in powerful ways. See the STARTUP FILE section below. |
1455 | .TP |
1456 | .B -why |
1457 | Print a message (to stderr) when and why a file is not considered. |
1458 | |
1459 | .SH "OPTIONS TELLING WHAT TO DO WITH FILES THAT WILL BE CONSIDERED" |
1460 | .TP |
1461 | .B -find |
1462 | (you can use |
1463 | .B -f |
1464 | as well). |
1465 | This option changes the basic action of |
1466 | .IR search . |
1467 | |
1468 | Normally, if a file is considered, it is searched |
1469 | for the regular expressions as described earlier. However, if this option |
1470 | is given, the filename is printed and no searching takes place. This turns |
1471 | .I search |
1472 | into a 'find' of some sorts. |
1473 | |
1474 | In this case, no regular expressions are needed on the command line |
1475 | (any that are there are silently ignored). |
1476 | |
1477 | This is not intended to be a replacement for the 'find' program, |
1478 | but to aid |
1479 | you in understanding just what files are getting past the exclusion checks. |
1480 | If you really want to use it as a sort of replacement for the 'find' program, |
1481 | you might want to use |
1482 | .B -all |
1483 | so that it doesn't waste time checking to see if the file is binary, etc |
1484 | (unless you really want that, of course). |
1485 | |
1486 | If you use |
1487 | .BR -find , |
1488 | none of the "GREP-LIKE OPTIONS" (below) matter. |
1489 | |
1490 | As a replacement for 'find', |
1491 | .I search |
1492 | is probably a bit slower (or in the case of GNU find, a lot slower -- |
1493 | GNU find is |
1494 | .I unbelievably |
1495 | fast). |
1496 | However, "search -ffind" |
1497 | might be more useful than 'find' when options such as |
1498 | .B -skip |
1499 | are used (at least until 'find' gets such functionality). |
1500 | .TP |
1501 | .B -ffind |
1502 | (or |
1503 | .BR -ff ) |
1504 | A faster more 'find'-like find. Does |
1505 | .nf |
1506 | -find -all -dorep |
1507 | .fi |
1508 | .SH "GREP-LIKE OPTIONS" |
1509 | These options control how a searched file is accessed, |
1510 | and how things are printed. |
1511 | .TP |
1512 | .B -i |
1513 | Ignore letter case when matching. |
1514 | .TP |
1515 | .B -w |
1516 | Consider only whole-word matches ("whole word" as defined by perl's "\\b" |
1517 | regex). |
1518 | .TP |
1519 | .B -u |
1520 | If the regex(es) is/are simple, try to modify them so that they'll work |
1521 | in manpage-like underlined text (i.e. like _^Ht_^Hh_^Hi_^Hs). |
1522 | This is very rudimentary at the moment. |
1523 | .TP |
1524 | .B -list |
1525 | (you can use |
1526 | .B -l |
1527 | too). |
1528 | Don't print matching lines, but the names of files that contain matching |
1529 | lines. This will likely be *much* faster, as special optimizations are |
1530 | made -- particularly with large files. |
1531 | .TP |
1532 | .B -n |
1533 | Pepfix each line by its line number. |
1534 | .TP |
1535 | .B -nice |
1536 | Not a grep-like option, but similar to |
1537 | .BR -list , |
1538 | so included here. |
1539 | .B -nice |
1540 | will have the output be a bit more human-readable, with matching lines printed |
1541 | slightly indented after the filename, a'la |
1542 | .nf |
1543 | |
1544 | % search foo |
1545 | somedir/somefile: line with foo in it |
1546 | somedir/somefile: some food for thought |
1547 | anotherdir/x: don't be a buffoon! |
1548 | % |
1549 | |
1550 | .fi |
1551 | will become |
1552 | .nf |
1553 | |
1554 | % search -nice foo |
1555 | somedir/somefile: |
1556 | line with foo in it |
1557 | some food for thought |
1558 | anotherdir/x: |
1559 | don't be a buffoon! |
1560 | % |
1561 | |
1562 | .fi |
1563 | This option due to Lionel Cons. |
1564 | .TP |
1565 | .B -nnice |
1566 | Be a bit nicer than |
1567 | .BR -nice . |
1568 | Prefix each file's output by a rule line, and follow with an extra blank line. |
1569 | .TP |
1570 | .B -h |
1571 | Don't prepend each output line with the name of the file |
1572 | (meaningless when |
1573 | .B -find |
1574 | or |
1575 | .B -l |
1576 | are given). |
1577 | |
1578 | .SH "OTHER OPTIONS" |
1579 | .TP |
1580 | .B -help |
1581 | Print the usage information. |
1582 | .TP |
1583 | .B -version |
1584 | Print the version information and quit. |
1585 | .TP |
1586 | .B -v |
1587 | Set the level of message verbosity. |
1588 | .B -v |
1589 | will print a note whenever a new directory is entered. |
1590 | .B -vv |
1591 | will also print a note "every so often". This can be useful to see |
1592 | what's happening when searching huge directories. |
1593 | .B -vvv |
1594 | will print a new with every file. |
1595 | .B -vvvv |
1596 | is |
1597 | -vvv |
1598 | plus |
1599 | .BR -why . |
1600 | .TP |
1601 | .B -e |
1602 | This ends the options, and can be useful if the regex begins with '-'. |
1603 | .TP |
1604 | .B -showrc |
1605 | Shows what is being considered in the startup file, then exits. |
1606 | .TP |
1607 | .B -dorep |
1608 | Normally, an identical file won't be checked twice (even with multiple |
1609 | hard or symbolic links). If you're just trying to do a fast |
1610 | .BR -find , |
1611 | the bookkeeping to remember which files have been seen is not desirable, |
1612 | so you can eliminate the bookkeeping with this flag. |
1613 | |
1614 | .SH "STARTUP FILE" |
1615 | When |
1616 | .I search |
1617 | starts up, it processes the directives in |
1618 | .IR ~/.search . |
1619 | If no such file exists, a default |
1620 | internal version is used. |
1621 | |
1622 | The internal version looks like: |
1623 | .nf |
1624 | |
1625 | magic: 32 : $H =~ m/[\ex00-\ex06\ex10-\ex1a\ex1c-\ex1f\ex80\exff]{2}/ |
1626 | option: -skip '.a .COM .elc .EXE .gz .o .pbm .xbm .dvi' |
1627 | option: -iskip '.tarz .zip .z .lzh .jpg .jpeg .gif .uu' |
1628 | <!~> option: -skip '~ #' |
1629 | |
1630 | .fi |
1631 | If you wish to create your own "~/.search", |
1632 | you might consider copying the above, and then working from there. |
1633 | |
1634 | There are two kinds of directives in a startup file: "magic" and "option". |
1635 | .RS 0n |
1636 | .TP |
1637 | OPTION |
1638 | Option lines will automatically do the command-line options given. |
1639 | For example, the line |
1640 | .nf |
1641 | option: -v |
1642 | .fi |
1643 | in you startup file will turn on -v every time, without needing to type it |
1644 | on the command line. |
1645 | |
1646 | The text on the line after the "option:" directive is processed |
1647 | like the Bourne shell, so make sure to pay attention to quoting. |
1648 | .nf |
1649 | option: -skip .exe .com |
1650 | .fi |
1651 | will give an error (".com" by itself isn't a valid option), while |
1652 | .nf |
1653 | option: -skip ".exe .com" |
1654 | .fi |
1655 | will properly include it as part of -skip's argument. |
1656 | |
1657 | .TP |
1658 | MAGIC |
1659 | Magic lines are used to determine if a file should be considered a binary |
1660 | or not (the term "magic" refers to checking a file's magic number). These |
1661 | are described in more detail below. |
1662 | .RE |
1663 | |
1664 | Blank lines and comments (lines beginning with '#') are allowed. |
1665 | |
1666 | If a line begins with <...>, then it's a check to see if the |
1667 | directive on the line should be done or not. The stuff inside the <...> |
1668 | can contain perl's && (and), || (or), ! (not), and parens for grouping, |
1669 | along with "flags" that might be indicated by the user with |
1670 | .BI -x flag |
1671 | options. |
1672 | |
1673 | For example, using "-xfoo" will cause "foo" to be true inside the <...> |
1674 | blocks. Therefore, a line beginning with "<foo>" would be done only when |
1675 | "-xfoo" had been specified, while a line beginning with "<!foo>" would be |
1676 | done only when "-xfoo" is not specified (of course, a line without any <...> |
1677 | is done in either case). |
1678 | |
1679 | A realistic example might be |
1680 | .nf |
1681 | <!v> -vv |
1682 | .fi |
1683 | This will cause -vv messages to be the default, but allow "-xv" to override. |
1684 | |
1685 | There are a few flags that are set automatically: |
1686 | .RS |
1687 | .TP |
1688 | .B TTY |
1689 | true if the output is to the screen (as opposed to being redirected to a file). |
1690 | You can force this (as with all the other automatic flags) with -xTTY. |
1691 | .TP |
1692 | .B -v |
1693 | True if -v was specified. If -vv was specified, both |
1694 | .B -v |
1695 | and |
1696 | .B -vv |
1697 | flags are true (and so on). |
1698 | .TP |
1699 | .B -nice |
1700 | True if -nice was specified. Same thing about -nnice as for -vv. |
1701 | .PP |
1702 | .TP |
1703 | .B -list |
1704 | true if -list (or -l) was given. |
1705 | .TP |
1706 | .B -dir |
1707 | true if -dir was given. |
1708 | .RE |
1709 | |
1710 | Using this info, you might change the last example to |
1711 | .nf |
1712 | |
1713 | <!v && !-v> option: -vv |
1714 | |
1715 | .fi |
1716 | The added "&& !-v" means "and if the '-v' option not given". |
1717 | This will allow you to use "-v" alone on the command line, and not |
1718 | have this directive add the more verbose "-vv" automatically. |
1719 | |
1720 | .RS 0 |
1721 | Some other examples: |
1722 | .TP |
1723 | <!-dir && !here> option: -dir ~/ |
1724 | Effectively make the default directory your home directory (instead of the |
1725 | current directory). Using -dir or -xhere will undo this. |
1726 | .TP |
1727 | <tex> option: -name .tex -dir ~/pub |
1728 | Create '-xtex' to search only "*.tex" files in your ~/pub directory tree. |
1729 | Actually, this could be made a bit better. If you combine '-xtex' and '-dir' |
1730 | on the command line, this directive will add ~/pub to the list, when you |
1731 | probably want to use the -dir directory only. You could do |
1732 | .nf |
1733 | |
1734 | <tex> option: -name .tex |
1735 | <tex && !-dir> option: -dir ~/pub |
1736 | .fi |
1737 | |
1738 | to will allow '-xtex' to work as before, but allow a command-line "-dir" |
1739 | to take precedence with respect to ~/pub. |
1740 | .TP |
1741 | <fluff> option: -nnice -sort -i -vvv |
1742 | Combine a few user-friendly options into one '-xfluff' option. |
1743 | .TP |
1744 | <man> option: -ddir /usr/man -v -w |
1745 | When the '-xman' option is given, search "/usr/man" for whole-words |
1746 | (of whatever regex or regexes are given on the command line), with -v. |
1747 | .RE |
1748 | |
1749 | The lines in the startup file are executed from top to bottom, so something |
1750 | like |
1751 | .nf |
1752 | |
1753 | <both> option: -xflag1 -xflag2 |
1754 | <flag1> option: ...whatever... |
1755 | <flag2> option: ...whatever... |
1756 | |
1757 | .fi |
1758 | will allow '-xboth' to be the same as '-xflag1 -xflag2' (or '-xflag1,flag2' |
1759 | for that matter). However, if you put the "<both>" line below the others, |
1760 | they will not be true when encountered, so the result would be different |
1761 | (and probably undesired). |
1762 | |
1763 | The "magic" directives are used to determine if a file looks to be binary |
1764 | or not. The form of a magic line is |
1765 | .nf |
1766 | magic: \fISIZE\fP : \fIPERLCODE\fP |
1767 | .fi |
1768 | where |
1769 | .I SIZE |
1770 | is the number of bytes of the file you need to check, and |
1771 | .I PERLCODE |
1772 | is the code to do the check. Within |
1773 | .IR PERLCODE , |
1774 | the variable $H will hold at least the first |
1775 | .I SIZE |
1776 | bytes of the file (unless the file is shorter than that, of course). |
1777 | It might hold more bytes. The perl should evaluate to true if the file |
1778 | should be considered a binary. |
1779 | |
1780 | An example might be |
1781 | .nf |
1782 | magic: 6 : substr($H, 0, 6) eq 'GIF87a' |
1783 | .fi |
1784 | to test for a GIF ("-iskip .gif" is better, but this might be useful |
1785 | if you have images in files without the ".gif" extension). |
1786 | |
1787 | Since the startup file is checked from top to bottom, you can be a bit |
1788 | efficient: |
1789 | .nf |
1790 | magic: 6 : ($x6 = substr($H, 0, 6)) eq 'GIF87a' |
1791 | magic: 6 : $x6 eq 'GIF89a' |
1792 | .fi |
1793 | You could also write the same thing as |
1794 | .nf |
1795 | magic: 6 : (($x6 = substr($H, 0, 6)) eq 'GIF87a') || ## an old gif, or.. \e |
1796 | $x6 eq 'GIF89a' ## .. a new one. |
1797 | .fi |
1798 | since newlines may be escaped. |
1799 | |
1800 | The default internal startup file includes |
1801 | .nf |
1802 | magic: 32 : $H =~ m/[\ex00-\ex06\ex10-\ex1a\ex1c-\ex1f\ex80\exff]{2}/ |
1803 | .fi |
1804 | which checks for certain non-printable characters, and catches a large |
1805 | number of binary files, including most system's executables, linkable |
1806 | objects, compressed, tarred, and otherwise folded, spindled, and mutilated |
1807 | files. |
1808 | |
1809 | Another example might be |
1810 | .nf |
1811 | ## an archive library |
1812 | magic: 17 : substr($H, 0, 17) eq "!<arch>\en__.SYMDEF" |
1813 | .fi |
1814 | |
1815 | .SH "RETURN VALUE" |
1816 | .I Search |
1817 | returns zero if lines (or files, if appropriate) were found, |
1818 | or if no work was requested (such as with |
1819 | .BR -help ). |
1820 | Returns 1 if no lines (or files) were found. |
1821 | Returns 2 on error. |
1822 | |
1823 | .SH TODO |
1824 | Things I'd like to add some day: |
1825 | .nf |
1826 | + show surrounding lines (context). |
1827 | + highlight matched portions of lines. |
1828 | + add '-and', which can go between regexes to override |
1829 | the default logical or of the regexes. |
1830 | + add something like |
1831 | -below GLOB |
1832 | which will examine a tree and only consider files that |
1833 | lie in a directory deeper than one named by the pattern. |
1834 | + add 'warning' and 'error' directives. |
1835 | + add 'help' directive. |
1836 | .fi |
1837 | .SH BUGS |
1838 | If -xdev and multiple -dir arguments are given, any file in any of the |
1839 | target filesystems are allowed. It would be better to allow each filesystem |
1840 | for each separate tree. |
1841 | |
1842 | Multiple -dir args might also cause some confusing effects. Doing |
1843 | .nf |
1844 | -dir some/dir -dir other |
1845 | .fi |
1846 | will search "some/dir" completely, then search "other" completely. This |
1847 | is good. However, something like |
1848 | .nf |
1849 | -dir some/dir -dir some/dir/more/specific |
1850 | .fi |
1851 | will search "some/dir" completely *except for* "some/dir/more/specific", |
1852 | after which it will return and be searched. Not really a bug, but just sort |
1853 | of odd. |
1854 | |
1855 | File times (for -newer, etc.) of symbolic links are for the file, not the |
1856 | link. This could cause some misunderstandings. |
1857 | |
1858 | Probably more. Please let me know. |
1859 | .SH AUTHOR |
1860 | Jeffrey Friedl, Omron Corp (jfriedl@omron.co.jp) |
1861 | .br |
1862 | http://www.wg.omron.co.jp/cgi-bin/j-e/jfriedl.html |
1863 | |
1864 | .SH "LATEST SOURCE" |
1865 | See http://www.wg.omron.co.jp/~jfriedl/perl/index.html |